[Suzerain of Sheol]

To my understanding, any sort of depiction of God is a sin (I think quite a severe one, but I can't recall what it's no-doubt horrific punishment is). This is something that the church has kind of ignored all its life. I think part of the split between the Eastern Orthodoxy and the Vatican was over the status of icons, and there was a great iconoclasm after they broke away. Don't quote me on that, though.

As to your other point, I'm of the opinion that even if there was a supreme entity, it wouldn't care one way or another for institutionalized religion. Such institutions have a tendency to become very earthly over time (if not in their inception). You have to wonder, at what point do those grand cathedrals with their glorious architecture and inspiring paintings become less for God's glory and more for the executive elite ecclesiarchy who commissioned them?